CN213688132U

CN213688132U - Servo valve torque motor pole shoe magnetic conduction surface detection device

Info

Publication number: CN213688132U
Application number: CN202023244875.6U
Authority: CN
Inventors: 陈曦
Original assignee: Chongqing Wentong Electromechanical Co ltd
Current assignee: Chongqing Wentong Electromechanical Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-07-13
Anticipated expiration: 2030-12-29

Abstract

In order to solve the problem that the detection error is increased by measuring for many times in the detection mode of the magnetic conduction surface of the pole shoe of the servo valve torque motor in the prior art; the utility model provides a servo valve torque motor pole shoe magnetic face detection device, which comprises a base plate, a sliding plate, an electromagnetic pole, a coil, a dial gauge seat and a dial gauge, wherein the base plate is provided with a magnetic face, the electromagnetic pole is arranged on the base plate, and the magnetic face is provided with a magnetic face; an inverted trapezoidal sliding groove is formed in the middle of the base plate; the two sides of the sliding plate are provided with concave shapes and sizes matched with the outline of the pole shoe and are inserted into the inverted trapezoidal sliding groove of the base plate; the electromagnetic poles are arranged on two sides of the concave bottom; the coil is arranged between the two electromagnetic poles; the two dial gauge seats are respectively arranged on two sides of the inverted trapezoidal sliding groove of the base plate; the dial indicator is fixed on the dial indicator seat. The beneficial technical effects of the utility model are that can lead the magnetic surface to two of pole shoe and detect simultaneously, guarantee the accuracy and the reliability that detect, improve detection efficiency.

Description

Servo valve torque motor pole shoe magnetic conduction surface detection device

Technical Field

The utility model relates to the production technology of high accuracy servo valve torque motor pole shoe, in particular to servo valve torque motor pole shoe magnetic conduction face detection device.

Background

The servo valve is a key component for converting an electrical signal into a proportional hydraulic signal, and the torque motor is a key component for converting an electrical signal into a proportional rotary motion in the servo valve. The torque motor comprises a permanent magnet, a lower pole shoe, an upper pole shoe, an armature, a coil and other parts (see figure 1). The permanent magnet is a cuboid, U-shaped grooves for accommodating fastening bolts are formed in two side faces in the length direction along the height direction, and the permanent magnet is magnetized in the height direction; the lower pole shoe and the upper pole shoe are rectangles with four cut corners, and two opposite sides in the length direction are provided with pole heads extending inwards; the armature is a geometrically symmetric long strip-shaped structure, the middle section of the armature is a step with a rectangular cross section, a central through hole is arranged in the center of the rectangular step perpendicular to the direction of the long strip axis, two ends of the armature are cylindrical rods, and the ends of the cylindrical rods are flat heads with rectangular cross sections; the coil is sleeved on the cylindrical rods at the two ends of the armature. When the permanent magnet is installed, the two permanent magnets are arranged between the upper pole shoe and the lower pole shoe, so that a uniform magnetic field is formed between the pole heads at the two ends of the upper pole shoe and the lower pole shoe; the armature is arranged on a thin-wall spring tube and is rigidly and fixedly connected with the baffle plate and the feedback rod, and rectangular flat heads at two ends of the armature are positioned in a pole shoe magnetic field. When current is passed through the coil, the magnetic field generated by the coil interacts with the pole piece magnetic field, causing the armature to deflect relative to the axis of the central bore. The deflection of the armature drives the baffle and the feedback rod which are rigidly and fixedly connected with the armature to move, and the opening degree and the opening direction of the nozzle and the slide valve which are related to the baffle and the feedback rod are changed, so that the liquid flow which is related to the baffle and the feedback rod is changed, and the effect of converting the electric signal into the hydraulic signal which is in direct proportion to the electric signal is realized.

In the case of high-precision and high-reliability control, the moment motor is required to have higher sensitivity, precision and reliability between the received electric signal and the generated deflection motion. To meet the requirement, the stability and reliability of the electromagnetic performance of the torque motor must be ensured. In particular for the pole shoe, a high dimensional accuracy is required in addition to the material properties that have to meet the relevant requirements. Since the planes on both sides of the pole head of the pole shoe are in contact with the permanent magnet and guide the magnetic force lines to the pole head, the pole head is called a pole shoe magnetic conduction surface. The related technology requires that the pole shoe magnetic conduction surface (see fig. 2, a is a reference surface, and B is a magnetic conduction surface) not only requires that the dimensional tolerance is within three thousandths of a millimeter, but also requires that the dimensional difference between two magnetic conduction surfaces on the same part is not more than two thousandths of a millimeter, and the flatness cannot exceed two thousandths of a millimeter. In the prior art, when the magnetic surfaces of the pole shoes are detected, a high-precision vernier caliper is adopted to detect the flatness of the pole shoes, and the sizes of the two magnetic surfaces are measured by the high-precision vernier caliper or a micrometer. And for consistency detection between the two magnetic conduction surfaces, the sizes of the two magnetic conduction surfaces relative to the reference surface are respectively measured, and whether the difference between the two magnetic conduction surfaces exceeds the technical requirement or not is judged.

Obviously, the servo valve torque motor pole shoe magnetic conduction surface detection mode in the prior art has multiple measurements, and detection errors are increased; the size difference between the two magnetic conduction surfaces cannot be directly measured, and the like.

Disclosure of Invention

In order to solve the problem that the detection error is increased by measuring for many times in the detection mode of the magnetic conduction surface of the pole shoe of the servo valve torque motor in the prior art; the poor scheduling problem of size between two magnetic conduction faces of unable direct measurement, the utility model provides a servo valve torque motor pole shoe magnetic conduction face detection device.

The utility model discloses a servo valve torque motor pole shoe magnetic conduction surface detection device, which comprises a base plate, a sliding plate, an electromagnetic pole, a coil, a dial gauge seat and a dial gauge; an inverted trapezoidal sliding groove is formed in the middle of the base plate; the two sides of the sliding plate are provided with slideways matched with the inverted trapezoidal chutes and inserted in the inverted trapezoidal chutes of the base plate, and the sliding plate is provided with a concave shape and a concave shape, the shape and the size of which are matched with the outline of the pole shoe; the two electromagnets are respectively arranged on two sides of the concave bottom; the coil is arranged between the two electromagnetic poles; the two dial gauge seats are respectively arranged on two sides of the inverted trapezoidal sliding groove of the base plate; the dial indicator is fixed on the dial indicator seat, and the detection probes of the dial indicator point to the inner sides of the two sides of the inverted trapezoidal sliding groove respectively.

Furthermore, the shape and size of the concave shape matched with the pole shoe outline on the sliding plate, and more than two electromagnetic poles and coils thereof are arranged along the sliding direction of the sliding plate.

The utility model discloses servo valve torque motor pole shoe magnetic conduction face detection device's beneficial technological effect can detect two magnetic conduction faces of pole shoe simultaneously, has guaranteed the accuracy and the reliability that detect, has improved detection efficiency.

Drawings

FIG. 1 is a schematic diagram of a servo valve torque motor;

FIG. 2 is a schematic diagram of a servo valve torque motor pole piece construction;

fig. 3 is a schematic structural diagram of the magnetic conduction surface detection device for the pole shoe of the torque motor of the servo valve of the present invention.

The following describes the magnetic conductive surface detection device of the pole shoe of the torque motor of the servo valve in accordance with the present invention with reference to the accompanying drawings and the following embodiments.

Detailed Description

Fig. 1 is a schematic structural diagram of a servo valve torque motor, in which 1 is a permanent magnet, 2 is a lower pole shoe, 3 is an upper pole shoe, 4 is an armature, and 5 is a coil. FIG. 2 is a schematic structural diagram of a pole shoe of a torque motor of a servo valve, wherein A is a pole shoe reference surface and B is a magnetic conduction surface.

Fig. 3 is the utility model discloses servo valve torque motor pole shoe leads magnetic surface detection device's structural schematic, and in the figure, 6 are the base plate, and 7 are the slide, and 8 are the electromagnetism pole, and 9 are the coil, and 10 are amesdial seat, and 11 are the amesdial. The magnetic conduction surface detection device for the pole shoe of the torque motor of the servo valve comprises a base plate 6, a sliding plate 7, an electromagnetic pole 8, a coil 9, a dial gauge seat 10 and a dial gauge 11; an inverted trapezoidal sliding groove is formed in the middle of the base plate 6; the two sides of the sliding plate 7 are provided with slideways matched with the inverted trapezoidal chutes and inserted in the inverted trapezoidal chutes of the base plate, and the sliding plate is provided with a concave shape and a concave size matched with the outline of the pole shoe; the number of the electromagnetic poles 8 is two, and the two electromagnetic poles are respectively arranged on two sides of the concave bottom; the coil 9 is arranged between the two electromagnetic poles; the two dial gauge seats 10 are respectively arranged on two sides of the inverted trapezoidal sliding groove of the base plate; the dial indicator 11 is fixed on the dial indicator seat 10, and the detection probes of the dial indicator are respectively directed to the inner sides of two sides of the inverted trapezoidal sliding chute. During detection, the pole shoe to be detected is placed in the concave shape of the sliding plate with the reference surface facing downwards, and the pole shoe can be stably placed in the concave shape due to the fact that the shape and the size of the concave shape are matched with the outline of the pole shoe. And a coil power supply is started, and a magnetic field generated by the coil further attracts the pole shoe to the concave bottom through the electromagnetic pole. The sliding plate is pushed to move towards the direction of the dial indicator along the sliding groove, the two magnetic guide surfaces of the pole shoe are in contact with the detection probe of the dial indicator, and the distance of the length of the magnetic guide surfaces of the pole shoe is slid under the detection probe of the dial indicator. In the process, parameters such as the thickness and the flatness of the magnetic conduction surface of the pole shoe, the size difference between the two magnetic conduction surfaces and the like can be detected by observing the change condition of the indicator value of the dial indicator. Of course, before detection, the standard module is needed to calibrate the detection position of the dial indicator detection probe and the indicated value of the dial indicator pointer, so that the detection data can be obtained more accurately and intuitively.

In order to improve the detection efficiency, the shape and size of the concave shape matched with the outline of the pole shoe on the sliding plate, and more than two electromagnetic poles and coils are arranged along the sliding direction of the sliding plate. Therefore, more than two pole shoes can be detected in a loading and unloading way, and the detection efficiency is improved.

Claims

1. A servo valve torque motor pole shoe magnetic conduction surface detection device is characterized by comprising a base plate, a sliding plate, an electromagnetic pole, a coil, a dial gauge seat and a dial gauge; an inverted trapezoidal sliding groove is formed in the middle of the base plate; the two sides of the sliding plate are provided with slideways matched with the inverted trapezoidal chutes and inserted in the inverted trapezoidal chutes of the base plate, and the sliding plate is provided with a concave shape and a concave shape, the shape and the size of which are matched with the outline of the pole shoe; the two electromagnets are respectively arranged on two sides of the concave bottom; the coil is arranged between the two electromagnetic poles; the two dial gauge seats are respectively arranged on two sides of the inverted trapezoidal sliding groove of the base plate; the dial indicator is fixed on the dial indicator seat, and the detection probes of the dial indicator point to the inner sides of the two sides of the inverted trapezoidal sliding groove respectively.

2. The servo valve torque motor pole shoe flux guide surface detection device as recited in claim 1, wherein the slide plate has at least two recesses with shapes and sizes matching the pole shoe profiles and its electromagnetic poles and coils, and is arranged along the sliding direction of the slide plate.